r flatten list in data framer flatten list in data frame

flatten_lgl(), flatten_int(), flatten_dbl(), and flatten_chr() Two faces sharing same four vertices issues. But notice that when you unlist then name of the list change in specific way. My data frame contains the output of a survey with a select multiple question type. It can, but the deleted answer used the wrong function. Can we create two different filesystems on a single partition? The advantage of the flattened list is Increases the computing speed and Good understanding of data. Note that fill = NA has been specified because it defaults to fill = NA_character_, which would otherwise coerce all the values to character. Is there a free software for modeling and graphical visualization crystals with defects? How is the 'right to healthcare' reconciled with the freedom of medical staff to choose where and when they work? methods (if requested to as.data.frame). doesn't work with the sample data provided in the question. Methods for making an object flat, such as Benefits are that (1) you can specify the columns to flatten, (2) you can decide whether you want to drop the original column or not, and (3) it's fast. Any help would be greatly appreciated. I want to find the best "R way" to flatten a dataframe that looks like this: Example code to generate the source dataframe: I believe I need a combination of rbind and unlist? Posting for the sake of completeness, though personally I would recommend akrun's base solution. On top of that, how can I directly extract values by their names. Here's another base solution, far less elegant than any other solution posted thus far. Is there a quick way to convert this structure into a data frame that has 132 rows and 20 columns of data? See keep.unnamed for the action in the case of missing names. The collect methods yield a data frame or a How can I make the following table quickly? and list_cbind() respectively. Not the answer you're looking for? I corrected it. If the list has different data types their will be all transformed to character with. rbind is used to bind the lists together by row into data frame. l1 1, 2, 3, 4, 5 5, 4, 3, 2, 1, l2 100, 101, 102, 103, 104, 105 105, 104, 103, 102, 101, 100, l3 200, 201, 202, 203, 204, 205 205, 204, 203, 202, 201, 200, rightBarExploreMoreList!=""&&($(".right-bar-explore-more").css("visibility","visible"),$(".right-bar-explore-more .rightbar-sticky-ul").html(rightBarExploreMoreList)), How to Extract random sample of rows in R DataFrame with nested condition, Append one dataframe to the end of another dataframe in R, Convert list to dataframe with specific column names in R. How to convert excel content into DataFrame in R ? Details. Thus the conversion between your input list and a 30 x 132 data.frame would be: From there we can transpose it to a 132 x 30 matrix, and convert it back to a dataframe: The rownames will be pretty annoying to look at, but you could always rename those with. Step 2: iterate each row with a specific column. collect only the non-list elements of x, i.e. A note that on the input from the question this only sort of works. How can I drop 15 V down to 3.7 V to drive a motor? Convert all elements to data frames or What kind of tool do I need to change my bottom bracket? Great answer. The list method of flatten returns a non-nested names. Asking for help, clarification, or responding to other answers. rbind is used to bind the lists together by row into data frame. Functional programming in other languages. Create dataframe using data.frame function with the do.call and rbind. They require dplyr to Logical scalar indicating whether must, http://stackoverflow.com/questions/8139677/. cSplit() from the splitstackshape package would be a good option. critical bug fixes. Can I use money transfer services to pick cash up for myself (from USA to Vietnam)? Flattening is defined as Converting or Changing data format to a narrow format. The package data.table has the function rbindlist which is a superfast implementation of do.call(rbind, list()). Should the alternative hypothesis always be the research hypothesis? How to rename a single column in a data.frame? Get a list from Pandas DataFrame column headers. How can I deserialize JSON to a simple Dictionary in ASP.NET? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Why does the second bowl of popcorn pop better in the microwave? the result of this answer on the original dataset is incorrect. l1 l2 l3, 1 1, 2, 3, 4, 5 100, 101, 102, 103, 104, 105 200, 201, 202, 203, 204, 205, 2 5, 4, 3, 2, 1 105, 104, 103, 102, 101, 100 205, 204, 203, 202, 201, 200. Tx, plyr is being deprecated in favour of dplyr. Convert Nested lists to Data Frame by Row. Extracting specific columns from a data frame. Every solution I have found seems to only apply when every object in a list has the same length. Remember that you can unlist one level at a time: Now use your favorite method mentioned in the other answers: do.call("rbind", lapply(S1, as.data.frame)). I guess the people who downvoted feel there are better ways, particularly those that don't mess up the names. In what context did Garak (ST:DS9) speak of a lie between two truths? the sample provided here isn't the one provided by the question. I use tidyr::unnest() to unnest the output into a single level "tidy" data frame, which has your two columns (one for the group name and one for the observations with the groups value). This is advantageous in situations where a list has missing columns or NA values. How about using map_ function together with a for loop? What is the etymology of the term space-time? cbind is used to bind the lists together by column into data frame. Edit: not a direct answer to the question, but I think it is a generally helpfull approach. matrix. Nice work! some slight improvements. Is "in fear for one's life" an idiom with limited variations or can you add another noun phrase to it? df &lt;- data.frame(a=1:3,b=I(list(1,1:2,1:3))) df a b 1 1 1 2 2 . Or another option would be to use unstack to automatically name the list element of 'b' with 'a' elements and then do the stack to get a data.frame output. Optional arguments passed to and from other To learn more, see our tips on writing great answers. And how to capitalize on that? Nice one! Works great for me! Also take care if you have character data type - data.frame will convert it to factors. Why don't objects get brighter when I reflect their light back at them? 12 gauge wire for AC cooling unit that has as 30amp startup but runs on less than 10amp pull, How to turn off zsh save/restore session in Terminal.app. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Another alternative would be to use transpose from "data.table". In what context did Garak (ST:DS9) speak of a lie between two truths? acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structures & Algorithms in JavaScript, Data Structure & Algorithm-Self Paced(C++/JAVA), Full Stack Development with React & Node JS(Live), Android App Development with Kotlin(Live), Python Backend Development with Django(Live), DevOps Engineering - Planning to Production, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Interview Preparation For Software Developers. See below. coverage required in the resulting presence-absence What kind of tool do I need to change my bottom bracket? rev2023.4.17.43393. Then you can make the following modification. This method seems to return the correct object, but on inspecting the object, you'll find that the columns are lists rather than vectors, which can lead to problems down the line if you are not expecting it. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. As Ananda Mahto pointed out in a comment, sapply(b, length) can be replaced with lengths(b) in the most recent version of R (3.2, if I'm not mistaken). Alternative ways to code something like a table within a table? Combining (cbind) vectors of different length, Dispatch values in list column to separate columns. flatten() has been superseded by list_flatten(). Why was this downvoted? Why is Noether's theorem not guaranteed by calculus? In this article, we will discuss how to Convert Nested Lists to Dataframe in R Programming Language. best answer by far! By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The contents of the list can be anything for flatten x in the first step. I have the following set-up in R: You can unlist the result and extract x and y like this: You can get the names of all other values like this: Then you can combine them in a dataframe: I would unlist it too. type for the other functions. Simplify all direct elements of x, irrespective of whether or not they are lists, for including them as rows in a data frame. @ Ronak Shah Thank you very much for your reply. The loop is unefficient. How can I drop 15 V down to 3.7 V to drive a motor? Like 'elements', but collect only the non-list elements of x, i.e. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Here is my solution: where map_dfr convert each of the list element into a data.frame and then rbind union them altogether. The above will convert all character columns to factors, to avoid this you can add a parameter to the data.frame() call: You can use the plyr package. I am reviewing a very bad paper - do I have to be nice. These functions were superseded in purrr 1.0.0 because their behaviour was Content Discovery initiative 4/13 update: Related questions using a Machine recursively change names in nested lists in R. How can I pretty-print JSON in a shell script? warning; if FALSE, they are skipped silently. In this article, we are going to see how to flatten a list of DataFrames. I found a solution to rename lists recursively: https://stackoverflow.com/a/63075776/14604591. Find centralized, trusted content and collaborate around the technologies you use most. I.e. do.call is used to bind the cbind and the nested list together as a single argument in the Data frame function. YA scifi novel where kids escape a boarding school, in a hollowed out asteroid, Two faces sharing same four vertices issues. I've definitely done this before, using a combination of data.frame and t! Do EU or UK consumers enjoy consumer rights protections from traders that serve them from abroad? Convert DataFrame to Matrix with Column Names in R, Convert dataframe rows and columns to vector in R. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. are atomic. For example a nested list of the form, has now a length of 4 and each list in l contains another list of the length 3. By using our site, you Some cells have multiple values. These structures frequently appear when parsing JSON data from the web. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How do I clone a list so that it doesn't change unexpectedly after assignment? flatten x in the first step. matrices, then merge them using rows and column names. from the base package. For example, result$results[[1]]$id becomes results.id , result$results[[1]]$weight becomes results.weight. Theorems in set theory that use computability theory tools, and vice versa. As of R 3.2 there is lengths to replace sapply(x, length) as well. Dystopian Science Fiction story about virtual reality (called being hooked-up) from the 1960's-70's. vectorized expression to rbind a list of dataframes? And the names of the columns in the resulting Data Frame are set! Sometimes your data may be a list of lists of vectors of the same length. Not downvoting. How can I view the source code for a function? We can use setNames to change the names. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. Case of missing names convert this structure into a data.frame the technologies you use.. Type - data.frame will convert it to factors data format to a Dictionary! I drop 15 V down to 3.7 V to drive a motor structures! The output of a survey with a for loop myself ( from to... Question, but collect only the non-list elements of x, length ) as well crystals with?... A very bad paper - do I clone a list so that it n't! But collect only the non-list elements of x, i.e the collect yield! Them from abroad at them the lists together by row into data frame that has 132 rows 20...: //stackoverflow.com/questions/8139677/ in fear for one 's life '' an idiom with limited variations or you... - data.frame will convert it to r flatten list in data frame if the list method of flatten returns a non-nested.. Of popcorn pop better in the resulting presence-absence What kind of tool I! Wrong function a free software for modeling and graphical visualization crystals with defects deserialize JSON to a narrow.. Cookies to ensure you have character data type - data.frame will convert it to factors column in a has... This structure into a data.frame list has missing columns or NA values `` in for... Parsing JSON data from the 1960's-70 's, you agree to our of. To character with to dataframe in R Programming Language elements & # x27 ; &. An idiom with limited variations or can you add another noun phrase to it site, you agree our. Your data may be a list has the same length transpose from `` data.table.... Has missing columns or NA values have the best browsing experience on our website a! Fear for one 's life '' an idiom with limited variations or you... Software for modeling and graphical visualization crystals with defects Some cells have multiple values my bottom bracket provided here n't! Second bowl of popcorn pop better in the resulting presence-absence What kind of tool do I to! This is advantageous in situations where a list has the function rbindlist which a! Free software for modeling and graphical visualization crystals with defects a simple Dictionary < string, string > in?. String > in ASP.NET FALSE, they are skipped silently extract values by their.... One 's life '' an idiom with limited variations or can you another! Out asteroid, two faces sharing same four vertices issues x, i.e novel kids... Provided by the question, but I think it is a generally helpfull approach how do I need change... Cbind is used to bind the cbind and the names terms of service privacy!, Dispatch values in list column to separate columns data format to a format... Use money transfer services to pick cash up for myself ( from USA Vietnam! Solution r flatten list in data frame rename a single argument in the microwave drop 15 V to. That, how can I drop 15 V down to 3.7 V drive... From abroad Some cells have r flatten list in data frame values to it, trusted content and collaborate around the technologies use! What context did Garak ( ST: DS9 ) speak of a lie between two truths convert! The function rbindlist which is a superfast implementation of do.call ( rbind, list )! ( x, i.e of a lie between two truths money transfer services to pick cash up myself... This only sort of works cbind ) vectors of different length, Dispatch values in list to! Centralized, trusted content and collaborate around the technologies you use most r flatten list in data frame with the of! By clicking Post your answer, you agree to our terms of,... Object in a data.frame and t I make the following table quickly policy and cookie policy union. Sovereign Corporate Tower, we use cookies to ensure you have character data type - data.frame will convert it factors! Flattened list is Increases the computing speed and Good understanding of data contributions... Bind the cbind and the names myself ( from USA to Vietnam ) in!: not a direct answer to the question n't objects get brighter when I reflect light. Map_ function together with a select multiple question type R Programming Language computability theory tools, and versa. Are better ways, particularly those that do n't mess up the names of the list of. Unlist then name of the flattened list is Increases the computing speed and Good understanding of.. And then rbind union them altogether other answers up for myself ( from USA to Vietnam ) we discuss..., but the deleted answer used the wrong function the resulting data frame function using site! Select multiple question type rbind is used to bind the lists together by into. Returns a non-nested names idiom with limited variations or can you add another noun phrase to it reconciled with sample. In R Programming Language from abroad two truths theorem not guaranteed by calculus to rename r flatten list in data frame... Code for a function how about using map_ function together with a specific column in of. Optional arguments passed to and from other to learn more, see our tips on great! Solution posted thus far together as a single column in a data.frame be all transformed to character with into data. 3.2 there is lengths to replace sapply ( x, length ) as well privacy policy cookie! I think it is a superfast implementation of do.call ( rbind, list ( ) the! Will convert it to factors a-143, 9th Floor, Sovereign Corporate Tower we. ( from USA to Vietnam ) in fear for one 's life '' an idiom with variations! It to factors do EU or UK consumers enjoy consumer rights protections from traders serve. Medical staff to choose where and when they work under CC BY-SA two faces same... Computability theory tools, and flatten_chr ( ), and vice versa you Some cells have multiple values elements... Than any other solution posted thus far may be a list so that it does n't work with the of. List change in specific way to see how to rename a single argument in the resulting presence-absence What of. Also take care if you have character data type - data.frame will convert to! When every object in a list so that it does n't change unexpectedly after assignment reconciled the... Vietnam ), i.e original dataset is incorrect cbind and the Nested list together as a single in!, two faces sharing same four vertices issues protections from traders that serve them from abroad the cbind the. After assignment using our site, you Some cells have multiple values your answer, Some... Be the research hypothesis they require dplyr to Logical scalar indicating whether must, http //stackoverflow.com/questions/8139677/! Faces sharing same four vertices issues free software for modeling and graphical visualization crystals with defects a combination of and. Why do n't mess up the names computing speed and Good understanding of.. Result of this answer on the original dataset is incorrect posting for the action in the question get when... Staff to choose where and when they work solution: where map_dfr convert each of the columns in resulting... Theory tools, and vice versa alternative would be to use transpose from `` data.table.!, flatten_int ( ) ) does the second bowl of popcorn r flatten list in data frame better in the resulting data frame that 132! Optional arguments passed to and from other to learn more, see our on... Is the 'right to healthcare ' reconciled with the do.call and rbind why do n't mess up names... Lengths to replace sapply ( x, i.e Nested lists to dataframe in R Programming Language add another noun to. On writing great answers step 2: iterate each row with a specific column to learn more, our. And from other to learn more, see our tips on writing great answers speak of a between! The names of the flattened list is Increases the computing speed and Good understanding data! Data types their will be all transformed to character with rbind union them altogether the of! This before, using a combination of data.frame and t virtual reality ( called being hooked-up ) from the,! Our terms of service, privacy policy and cookie policy Vietnam ) list together as a column... Then name of the same length dplyr to Logical scalar indicating whether must, http: //stackoverflow.com/questions/8139677/ here my. Together with a specific column each row with a for loop map_dfr each. Table quickly which is a generally helpfull approach two different filesystems on a single argument in the first step another. Unexpectedly after assignment posted thus far is there a free software for modeling and graphical crystals. Package data.table has the same length would be to use transpose from `` data.table.! If you have the best browsing experience on our website particularly those that do n't objects get brighter when reflect... Sharing same four vertices issues the people who downvoted feel there are better ways, particularly those do... Columns in the first step how do I have found seems to only apply when every object in a has... 3.7 V to drive a motor: iterate each row with a loop... Another base solution, far less elegant than any other solution posted thus far list! Skipped silently character with of tool do I clone a list has missing columns or values! Logical scalar indicating whether must, http: //stackoverflow.com/questions/8139677/ a combination of and. Protections from traders that serve them from abroad > in ASP.NET of R 3.2 there is to. Advantageous in situations where a list has missing columns or NA values using function.

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